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Salary
$160k – $235k per year
Location
In office (McLean)
Employment
Full-Time

First seen by Alion on Sep 2, 2026.

Overview
Company
Impact
Profile match
Cornerstone Defense LLC is a Small Business servicing the Intelligence, Defense, and Space communities of the U.S. Government. Our high-end engineers bring agile and differentiated solutions to the war fighter and mission partners.

Security clearance: Public Trust

Network Engineer
McLean, VA

Salary Range: $160-235k
The on-site Network Engineer shall perform the following minimum duties:
  • Assisting the System Administrators as assigned by the Lead System Administrator.
  • Assisting the Lead Network Engineer in developing and implementing IT/network plans
  • Managing network operations using simple network management protocol (SNMP) network management tools.
  • Diagnosing and troubleshooting network problems with network protocol capture/decode analyzers.
  • Planning and building network from open system interconnect (OSI) Layer 1 through Layer 3.
  • Managing TCP/IP internetworking connectivity to include addressing and subnetting.
  • Monitoring network as defined in the network monitoring plan.
  • Installing, configuring, updating and documenting the physical cable plant.
  • Installing, configuring and managing networking hardware (switches, bridges, hubs, concentrators, transceivers).
  • Installing, configuring and managing network security (firewalls, IP blocking).
  • Configuring and managing virtual private networks (VPNs)
Required Skills:
  • Bachelor's degree in computer science, information systems, engineering, mathematics or four (4) years equivalent experience as network engineer or network technician.
  • Six (6) years' experience with Cisco Catalyst switches and other Cisco network hardware.
  • Seven (7) year intelligence community experience as a network engineer or network administrator.
Desired Skills:
  • 3-5 years of HAND-ON network engineering experience in customer environment
  • Hands-on Cisco firewall experience (ASA/Firepower 5510, 5515X, FP4100's, etc...)
  • Hands-on Cisco Catalyst switch experience (Nexus switch experience would be a HUGE plus)
  • CCNP-level knowledge of Cisco networking (No requirement for certification, but understanding at this level is required)
  • Familiarity with cabling types/standards (i.e., Single Mode vs. Multi Mode, LC connector vs. SC connector, Cat5/6/7, etc...)
  • Good understanding of network link virtualization technologies (i.e., Ether-channel/Port-channel, Nexus virtual port-channels (vpcs))
  • Willingness to perform layer 1 tasks as needed (pulling cable, racking/stacking, etc...)
  • Strong troubleshooting skills
  • Strong project management experience (i.e., ability to manage projects through their full lifecycle in order to meet deadlines)
  • Ability to use MS Visio to produce network diagrams
  • Must be able to survive and thrive in a non-enterprise, fast paced environment
  • Ability to create and present presentations and other ad-hoc technical briefings as necessary
  • Understanding of how mission enclaves communicate with Enterprise networks
  • Familiarity with Cisco Firewall Management Center to manage Firepower firewall
  • Experience with Cisco Nexus Ethernet switching platforms (Nexus 5500, 5600, 7700, and 9500)
  • Experience with Cisco MDS Fibre Channel switching platforms (MDS 9000)
  • Familiarity with Storage Area Networking (SAN) and Fibre Channel protocols and standards
  • Familiarity with Linux operating system
  • Familiarity with SolarWinds network management/monitoring tool
  • Familiarity with virtual appliances (switches, firewalls, etc...)
  • Familiarity with JIRA
  • Experience working in a 'mission-like' environment (outside of Enterprise comms)
  • AWS/Cloud familiarity
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